Improvement in scroll-sawing machines



Z Sheets-Sheet 1.

I. ARTHUR.

' SCROLL-SAWING MACHINE. No.188.,ZZ5. Patented March13, 1877.

' Wed.

UNITED STATES PATENT IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. 188.225, dated March13, 1877; application filed February 19, 1877.

To all whom it may concern:

Be it known that I, ISAIAH ARTHUR, of Shepherdstown, Cumberland county,Pennsylvania, have invented an Improvement in Scroll-Sawing Machines;and I hereby declare the following to be a full, clear, and exactdescription of the same, reference being bad to the accompanyingdrawings, and the letters of reference marked thereon, in which Figurelrepresents a front-end elevation; Fig. 2, a side elevation. Fig. 3 is aview of a portion of the mortiser. Fig. 4 is a top or plan view of thecombin'eddevioe. Fig. 5 represents the driving mechanism of thescrollsawing machine in proper position upon its supporting-frame. Fig.6 represents the upper part of the mortiser on an enlarged scale.

My invention consists in a peculiarly-cow structed saw-straining frame,used in combination with proper actuating mechanism, whereby the saw isgiven a proper vertical reciprocatory motion, while, at the same time,great freedom for the handling of work is provided in the rear of thesaw-blade.

The frame or supporting uprights consist, mainly, of three verticalpieces, marked A, A, and B in the drawings. (See Figs. 1 and 2.) Saidpieces are placed so that the two, A A, are at the front end of thesawing-table, a proper distance apart, and that their front faces willlie in the same vertical plane. The vertical piece B is placed a properdistance in the rear of the two vertical pieces A A, and

equally distant from each. The three vertical pieces are rigidlyconnected together by the side pieces 9 and 10. These are four innumber, two above that are framed into the upper ends of the verticalpieces A A, their other ends being firmly secured by screw-bolts, orother suitable means, to the vertical piece B. The two lower side pieces10 10 are framed into the three vertical pieces A A B a short distancefrom the lower ends of same. Two parallel braces, 11 12, (see Fig. 1,)are framed into the vertical pieces A A, so as to insure strength andproper stability. The vertical pieces of timber A A (see Figs. 2 and 5)are framed into the side pieces 9 9 10 10 upon each side of theframe-work of the sawing-machine. Said pieces A A are intended tosupport the crank-shaft 1 and main band-wheel d that gives motion tothe'scroll-saws. Said saw 8 is secured, by suitable means, at each of itsends to the parallel bars a 5. These bars are made of tough hard wood ofsuch a width and thickness. as to insure the requisite strength andstiffness, and of sufficient length to fur- I nish the proper amount ofroom or space between the vertical piece B and the rear edge of thesaw-blade, so that the material to be sawed can be readily moved in anydesired direction without obstruction. The bars a b are pivoted at theirrear ends to the vertical piece B, slots or mortises of suitable sizebeing made, in the front face of the same for their reception. A brace,0, made of wood or other suitable material, is secured in position at apoint, 0 0 between the ends of the bars a b, and. serves to support andsecure the sawblade 8, and enable a proper degree of tension to be giventhe same. Upon the upper faces of the side pieces 9 9 and the parallelbrace 11 the saw-table D is secured. Its form is clearly shown in theplan view, Fig. 4, being triangular, withits front edge rounded to forman arc of a circle from the outer edges of the vertical pieces -A A.(See Figs. 1 and 4.)

By inspection of Fig. 5 it will be noticed that the crank-shaft l issecured near its outer ends in journal-boxes 2 3. Said crank-shaft l ismade of such size, in proportion to the capacity of the machine, as toinsure sufficient strength, and is constructed with journaled cranks 0 0at each end that lie in the same plane. (Shown in Figs. 2, 4, 5. Uponsaid crank-shaft 1 is rigidly secured the main band-wheel 01. (SeeFig.5.) Immediately beneath the crank-shaft 1, and in a line parallel toit, is located a short shaft, 00. This is secured by boxes in positionupon the framepiece It and side piece 10. (See Fig. 5.) Upon the shortshaft 00 is moun ted and securely fastened the pulley w, which is soadjusted as to be in line with the main band-wheel d, from which itreceives motion by means of a belt. Upon the inner projecting end of theshort shaft 00 the fiy-wheel f is 1 secured. To the outer face of saidwheel the pitman or connecting-rod e is attached by the crank-pin 8, thepoint of insertion of said pin in an arm of said wheel f being such adistance from the axial center of the short shaft .10 as to insure therequired crank'motion to give the saw 8 a sufficient verticalreciprocatory movement.

In Figs. 1, 2, 4, and 5 is shown the actuating-treadle 0. As will benoticed in Figs. 2 and 4, said treadle O is pivoted at its rear end tothe side pieces 10 10 upon their outer faces. The treadle is,preferably, made of hard tough wood, and is given the form substantiallyas shown in Fig. 4.. It consists of two pieces of timber, that aresecured as stated, at their rear ends to the side frame of thescroll-saw, their front ends being connected together by a curved piecethat is securely bolted at each of its ends to the same. The crank-shaftl is connected to the treadle O by the parallel connecting-rods m mpassing through slots cut in the side bars of the treadle 0, their lowerends being pivoted therein, the upper ends having a movable connectionwith the journaled cranks o 0.

It is evident from the foregoing description that a movement of thetreadle G will cause a rapid vertical reciprocatory motion of the saw 8.

The vertical piece B of the frame of the sawing-machine also carries themechanism of the mortising-machine E, as is shown in Figs. 2 and 4. Itis of simple construction, and consists, mainly, of a verticalchisel-stock, 13, held in position by the guide-brackets l t thatproject from a metallic platethat is secured to the rear face of theupper end of the vertical piece B. Between said brackets lt upon saidplate a guide-slot is formed that is intended to receive the inner endof the traveling-block 2, which is rigidly secured to the chisel-stocki. The upper end of said chisel-stock i has a swivel-loop attachedthereto, into which is inserted the adjustable hook h. Said hook isplainly shown in Fig. 6. It has several holes of proper size made in itsbody for the reception of the free end of the curved spring '0. (SeeFigs. 1 and 6.) An arnnp, projects at a right angle to the body ofthechisel-stock i,

which enables the tension of the curved spring.

'0 to be increased or weakened, as maybe necessary in the mortising ofwood of different thicknesses and degress of hardness.

Having given a description of my invention andits manner of operation,what I claim as new, and desire to secure by Letters Patent of theUnited States, is-

The combination of the barsa b, brace 0, saw .9, parallelconnecting-rods m m, crankshaft l, main band-wheel d,pulley w, fly-wheelf, pitman-rod e, treadle G, and frame A A B, as herein set forth, andfor the purpose specilied.

ISAIAH ARTHUR. [L. s.] Witnesses:

W. H. H. SIEG, WM. Pv-PATTON.

